Apparatus for heating size for surfacing paper



(No Model.) W. O. EDWARDS.

APPARATUS FOR HEATING SIZE FOR SUREAUING PAPER.

498,775. Patented June 6, 1893.

: NOflRIS ravens cu. puo'rcxumov wAsnmmou n c UNITED STATES PATENT OFFICE.

WILLIAM C. EDWARDS, OF-HOLYOKE, MASSACHUSETTS.

APPARATUS FOR HEATING SIZE FOR SURFACING PAPER.

SPECIFICATION forming part of Letters Patent No. 498,775, dated June 6, 1893.

Application filed March '7, 1892. Serial No. 23,962- (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM Oi EDWARDS, of Holyoke, in the county of Hampden and State of Massachusetts, have invented a new and useful Apparatus for Heating Size for Surfacing Paper, of which the following is a specification, reference being had to the accompanying drawings, forming part thereof.

The object of my invention is to provide a simple and inexpensive apparatus for heating the size used on paper machines, so constructed and operating that the degree of heat imparted to the size can be accurately predetermined, the size can be uniformly heated, and all possibility of burning or discoloring the same is avoided.

To these ends, my invention consists in the apparatus hereinafter fully described and particularly pointed out in the claims.

Referring to the drawings, in which like letters designate like parts in the respective views, Figure 1 is a diagram illustrating the apparatus devised by me for applying heat to size during its passage from a size-tank to the size-box of a paper machine. Fig. 2 is a detail View of a part of said apparatus hereiuafter more particularly referred to.

The letter a designates a size-box of the form usually employed on paper machines, said box having the overflow compartment a, and b b the rolls between which the web of paper 0 passes, as indicated by the arrows, as it comes from the driers of the machine.

The letter (Z designates the size-tank into which the size is conducted by pipe d from the point where it is prepared, and e designates the pump by which the size is forced upwardly into the box a from said tank, through a Suitable conduit, the piston of said pump receiving its movement from a crankdisk e operated by a belt connection with a pulley on the shaft of roll I).

The letter f designates a return pipe leading from the compartment a of box a into tank at, by which the surplus size is conducted back into said tank. The pipe or conduit g leading from tank (1 to the pump and from the latter to box a, is provided with suitable check-valves g, located upon either side of said pump, to enable the latter to properly perform its function of drawing the size from said tank and forcing it upwardly into said box.

- The letter 71 designates a pipe or conduit extending from the floor on which tank (1 is located through the floor above, to a point adjacent to size-box a, which conduit is say four inches in diameter, the exact diameter thereof being immaterial. Into Said conduit, near the bottom thereof, leads the pipe 9 from pump 2 and tank d, said pipe having a valve 9 located therein adjacent to the conduit for governing the passage of size to the latter. From said conduit, near the bottom thereof, leads an outlet pipe h having a valve 72;, to facilitate washing the conduit as hereinafter described. I prefer to make the conduit hin two sections, and to connect the pipes g and h thereto by means of a connection ring 72 as shown, but such construction is not material, any form of steam tight connection being sufficient. At its upper end said conduit has open communication with size-box a,and such communication is preferably formed by means of a siphon shaped pipe 7L suitably seated at one end in a cap upon the end of the conduit, in such manner as to make a steam tight joint, and having its opposite end located within the box 0, preferably near the bottom of the latter. With the parts thus arranged, the pump eis adapted to withdraw the Size from tank (1 and force it into conduit h, and upwardly through the latter into the size-box,said conduit, with each stroke of the pump, discharging a quantity of size from its upper end into said box corresponding to'the quantity forced into the lower end thereof by the pump. A gradual andintermittent upward movement of the size within the conduit is thus secured.

The letter Zr designates a return-bend steam pipe extending upwardly within the conduit h from the bottom nearly to'the upper end thereof, as shown, one leg of said pipe, at the bottom of the conduit being in open communication with a steam-supply pipe m, leading from a boiler and containing valve m, and the other leg being in open communication with a pipe n leading to a condenser 0, or to any point where it may be desired to further utilize the steam for any purpose, said pipe containing check valve a. To Secure a perfectly tight joint at the point where the return-bend pipe enters the conduit h, I prefer to secure a cap k to the bottom of said conduit, into which cap are screwed two short,

threaded sections of pipe 70' k, and to con nect the two legs of pipe 70 and the ends of pipes on and n to said sections by means of suitable couplings, as, shown in Fig. 2. Such construction also enables me to readily remove pipe ]0 from the conduit and to replace it therein, if' it should become necessary or desirable to do so. The pipe 75 may be returned at its upper end by a simple bend, or may be provided with a return-bend coupling as shown, as may be most convenient.

The operation of the apparatus thus constructed is as followsz-Valve m being opened, thus causing a circulation of steam through pipe 70, and valves 9 and g being opened thus opening pipe g for the passage of the size from tank (1 to the conduit h, pump a is set in operation. The size as it is forced into the conduitby said pump gradually rises therein, around the two legs of pipe 7t, and the.

heat thrown off by said pipe causes the size to become warmer and warmer as it rises, until it has reached the top of the conduit and begins to flow from the latter into box a, the hottest portion of the size in the conduit at all times being that portion at the top thereof. It will be apparent, therefore, that by regulating the admission of steam to pipe 75 the temperature of the size which flows into box a from said conduit can be accurately determined, and, furthermore, that having once secured the desired temperature, the same will be maintained uniformly so long as valve m is left unchanged and the pressure of steam in the boiler which supplies the heat is kept at substantially the same point. It is obvious also that the heat being applied to the size just before it enters the size-box, it does not have time to cool before it reaches the paper, and can be'presented to the latter at any desired degree of temperature. Perfectly uniform paper, so far as the sizing thereof is concerned, can thus be made with the use of this apparatus. There being a constant circulation of the size over the surface of pipe 70, the tendencyof the former to adhere to the latter is reduced to a minimum, but should it become necessary to wash thesurface of said pipe, such operation can be performed very quickly and easily by closing valve 9 opening valve 71 and filling box a with water. The water in said box will be carried'by siphonic action through pipe it into and through the conduit, and out of the latter through pipe 71., washing the surface of pipe is in its passage and thoroughly cleaning the same. The washing water in the conduitcan be heated to the boiling point in a few moments from the pipe 70, by temporarily closing valve 72?, should it be found desirablein order to remove any coating of the size on the pipe or inner surface of the conduit.

The amount of steam required to heat the size in connection with my novel apparatus is but slight as compared with that required for steam coils located in tank (I, for the rea- \\son that only a comparatively small quantity of the size is heated at one time and that just before it is delivered to box a, and for the same reason the loss of time in starting the paper machine after a shut down, heretofore necessitated, is avoided.

By my heating apparatus, the size cannot become blackened, and all the trouble and damage caused by a too cool condition of the size are obviated. The surplus size flows from box a back into tank cl in the same manner as heretofore.

I have illustrated the use of the heatingapparatus devised by me in connecti onxwithlgg tank 01 as the source from whence the size passes to said apparatus for the reason that such tanks are now generally employed in connection with paper machines, but it will be understood that said tank forms no portion of the heating apparatus, and that the size can be drawn from any other source.

It would be possible to utilize hot. air in the pipe as the heating agent instead of steam, but I prefer to employ steam, as the same can be readily taken from the boilers with which all paper mills are provided.

I prefer to provide pipe g with the valves g g, located as shown, to facilitate cleaning tank 61 and said pipe by passing water therethrough. The diameter of pipe 71. will preferably be considerably less than that of conduit h, as shown, to facilitate accurate regu lation of the temperatureof the size, and the siphonic action thereof in cleaning the conduit.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination with the size-box of a paper machine of a vertically disposed conduit terminating at its upper end in a pipe of less diameter which leads into said box, a return-bend pipe for a heating agent located within said conduit and having suitable connections whereby a heating agent can be caused to circulate through said pipe, a supply pipe for size communicating with said conduit at or near the bottom thereof, and a pump for forcing size through said conduit into said size-box, arranged and operating substantially as set forth.

2. The combination with the size-box of a paper machine of conduit It provided at its upper end with, the siphon shaped pipe 7L leading into said box and having at its lower end the outlet h, return-bend pipe 7t located within said conduit, one leg of said pipe communicating with steam pipe m and the other with pipe n, and size supply pipe 9 communicating with said conduit at its lower end, said pipes m and g and outlet h being provided with suitable valves, arranged and operating substantially as and for the purpose set forth.

WILLIAM C. EDWARDS.

Witnesses:

W. H. CHAPMAN, J. E. CHAPMAN.

IIO 

